US PATENT SUBCLASS 229 / 81
.~.~.~ Perforated

Current as of: June, 1999
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229 /   HD   ENVELOPES, WRAPPERS, AND PAPERBOARD BOXES

68.1  DF  ENVELOPE {10}
76  DF  .~ Closures {3}
80  DF  .~.~ Sealing {4}
81.~.~.~ Perforated

DEFINITION

Classification: 229/81

(under subclass 80) Envelope closures of the gummed type, but in which there are perforations for the purpose of preventing the opening of the envelope without detection.